Hermetic compressor with discharge pulsation reducing member mounted thereon

ABSTRACT

The present disclosure relates to a hermetic compressor with a discharge pulsation reducing member mounted therein, the hermetic compressor including a case; a cylinder block disposed in the case; a discharge muffler disposed on the upper portion of the cylinder block and having a first chamber and a separate second chamber to reduce the pulsating components of the discharged refrigerant, the first chamber and the second chamber being connected to each other by a connection passage inside the discharge muffler; and the discharge pulsation reducing member fixed in the connection passage and having a pulsation reducing passage formed along the outer peripheral surface thereof.

TECHNICAL FIELD

The present invention relates to a compressor, and more particularly, toa hermetic compressor that has a discharge pulsation reducing membermounted thereon to control the pulsating components of a working fluidand to reduce the vibration and noise generated from the compressorduring the refrigeration cycle.

BACKGROUND ART

Generally, a refrigeration cycle is a process wherein compressedrefrigerant gas having a high temperature and high pressure by operationof a compressor is liquefied by a condenser and then vaporized in anevaporator via an expansion valve, thereby conducting cooling using thevaporization heat of the refrigerant.

In the process of the refrigeration cycle, the compressor is a devicefor compressing the gaseous refrigerant from the evaporator, where theliquid refrigerant is evaporated and cooled by removing the surroundingheat, into high temperature and high pressure.

However, the pulsating components, which are generated when the gaseousrefrigerant is discharged from the compressor to the condenser, excitethe pipe of the refrigeration cycle, thereby generating noise andvibrations in the refrigeration cycle.

To reduce the above-mentioned problems, a discharge muffler is mountedon a cylinder block to reduce the noise in the discharge passage of thecompressor.

The discharge muffler is adapted to reduce the pulsation of therefrigerant discharged from the compressor, and is separated into afirst chamber and a second chamber connected to each other by aconnection passage.

Further, the first chamber is connected by a passage to a cylinder coverhaving a space into which a high pressure refrigerant is supplied from acylinder, and the second chamber is connected to a discharge pipe.

In the conventional practice, the noise caused from the pulsation of therefrigerant is reduced by the discharge muffler having theabove-mentioned configuration, but if the connection passage connectingthe first chamber and the second chamber is provided only by a castingprocess, the length of the connection passage is restricted, and thepulsation reducing effects are limited.

To overcome the above-mentioned problems, recently, there have beenproposed technologies where a pipe having a given inner diameter andlength connects the first chamber and the second chamber, therebyreducing the pulsating components of the refrigerant much more.

In this case, however, the pipe is exposed to the exterior of thecylinder block and interferes with the internal wall of the externalcase of the compressor, and therefore, the installation of the pipeshould be considered upon designing the external case. Especially, ifthe pipe is mounted inside the chamber, the chamber should be increasedin size to accommodate the pipe therein, thereby making the size of thecylinder block undesirably bulky.

Accordingly, the space utilization and productivity of the compressorare decreased.

DISCLOSURE Technical Problem

Accordingly, the present invention has been made in view of theabove-mentioned problems occurring in the prior art, and it is an objectof the present invention to provide a hermetic compressor with adischarge pulsation reducing member therein that has a connectionpassage in a cylinder block to connect a first chamber and a secondchamber, and the discharge pulsation reducing member fixedly mountedinside the connection passage to increase the refrigerant passage,thereby reducing the discharge pulsation, without any separateinstallation space.

Technical Solution

To accomplish the above object, according to the present invention,there is provided a hermetic compressor with a discharge pulsationreducing member therein, the hermetic compressor including a case; acylinder block in the case; a discharge muffler on an upper portion ofthe cylinder block and having a first chamber and a separate secondchamber to reduce pulsating components of discharged refrigerant, thefirst chamber and the second chamber being connected to each other by aconnection passage; and the discharge pulsation reducing member fixed inthe connection passage and having a pulsation reducing passage along anouter peripheral surface thereof.

According to the present invention, preferably, the pulsation reducingpassage together with the connection passage form a passage for therefrigerant.

According to the present invention, preferably, the pulsation reducingpassage of the discharge pulsation reducing member has a screw shape.

According to the present invention, preferably, the discharge pulsationreducing member is screwed to the connection passage correspondingthereto.

According to the present invention, preferably, the discharge pulsationreducing member is tapered in the longitudinal direction thereof andfixed to the connection passage by an interference fit.

According to the present invention, preferably, the discharge pulsationreducing member has a head having one of various shapes to allow a use atool to be used for the coupling to the connection passage.

According to the present invention, preferably, the discharge pulsationreducing member has a cross-sectional shape selected from a circularshape and a polygonal shape.

According to the present invention, preferably, the pulsation reducingpassage has an inlet and an outlet on opposed ends thereof incommunication with each other in the longitudinal direction thereof.

Advantageous Effects

According to the present invention, the hermetic compressor with adischarge pulsation reducing member mounted therein is provided with aconnection passage in the cylinder block to connect the first chamberand the second chamber and with the discharge pulsation reducing memberfixed in the connection passage to increase the refrigerant passagelength, thereby controlling pulsating components of the refrigerant andfurther reducing the vibrations and noise generated during therefrigeration cycle.

In addition, the discharge pulsation reducing member is mounted fixedlyinside the connection passage in the cylinder block, and accordingly, noseparate installation space is needed, thereby decreasing the size ofthe external case of the compressor and thus increasing the spaceutilization and productivity of the compressor.

Further, the length and cross-sectional area of the pulsation reducingpassage of the discharge pulsation reducing member can be changed inaccordance with the pulsation properties of the compressor, therebycontrolling the pulsation in accordance with the discharge states of therefrigerant.

DESCRIPTION OF DRAWINGS

FIGS. 1 and 2 are cutaway perspective and front cross-sectional viewsshowing a hermetic compressor with a discharge pulsation reducing membermounted therein according to the present invention.

FIG. 3 is a cross-sectional view showing the hermetic compressor with adischarge pulsation reducing member mounted therein according to thepresent invention.

FIG. 4 is a perspective view showing one example of the dischargepulsation reducing member of FIG. 3.

FIGS. 5 and 6 are perspective views showing other examples of thedischarge pulsation reducing member in the hermetic compressor accordingto the present invention.

FIG. 7 is a graph showing the discharge pulsations between the inventionand a comparison example.

DETAILED DESCRIPTION

Hereinafter, an explanation of a hermetic compressor with a dischargepulsation reducing member mounted therein according to the presentinvention will be given in detail with reference to the attacheddrawings, FIG. 1 to FIG. 7.

According to the present invention, as shown in FIGS. 1 and 2, ahermetic compressor with a discharge pulsation reducing member mountedtherein, which is installed in a machine room of a refrigerator andconnected to a condenser (not shown) to compress gaseous refrigerant toa high pressure and to supply the compressed refrigerant to thecondenser, generally includes a case 1, a cylinder block 100 disposed inthe case 1 and a discharge muffler 200 disposed in an upper portion ofthe cylinder block 100 to reduce the pulsating components of thedischarged refrigerant.

The discharge muffler 200 has a first chamber 210 and a separate secondchamber 220, and the first chamber 210 and the second chamber 220 areconnected to each other by a connection passage 10.

Further, the first chamber 210 is connected by a passage 212 to acylinder cover 211 having a space on one side thereof to receive thehigh pressure refrigerant discharged from a cylinder, and the secondchamber 220 is connected to a discharge pipe 221.

In this case, the connection passage 10 serves to connect the firstchamber 210 and the second chamber 220 to each other and further tocontrol the pulsating components of the refrigerant.

That is, after the high temperature and high pressure refrigerantintroduced into the discharge muffler 200 flows into the first chamber210, it is passed through the connection passage 10 and sent to thesecond chamber 220, so that the flow velocity of the refrigerant isreduced and the refrigerant having a reduced flow velocity is suppliedto the condenser through the discharge pipe 221.

According to the present invention, as shown in FIG. 3, a dischargepulsation reducing member 20, which has a bar-like shape to increase thepassage length of the refrigerant, is fixedly inserted into theconnection passage 10 to reduce the pulsating components of therefrigerant, that is, the vibrations and noise, under the conditionswhere the size and shape of the discharge muffler 200 are not changed.

As shown in FIGS. 4 to 6, the discharge pulsation reducing member 20according to the present invention includes a groove-shaped pulsationreducing passage 21 formed along the outer peripheral surface thereofand an inlet 22 and an outlet 23 on opposed ends of the pulsationreducing passage 21 in communication with each other in the longitudinaldirection thereof.

To rigidly fix the discharge pulsation reducing member having theabove-mentioned structure to the connection passage 10, a screw threadis formed along the outer peripheral surface of the discharge pulsationreducing member 20, and a screw thread to be fastened correspondingly tothe screw thread on the discharge pulsation reducing member 20 is formedalong the connection passage 10, so that the discharge pulsationreducing member 20 and the connection passage 10 are screwed to eachother. Alternatively, the discharge pulsation reducing member 20 istapered in the longitudinal direction thereof and fixed to theconnection passage 10 by an interference fit.

Accordingly, the pulsation reducing passage 21 together with theconnection passage 10 form a passage for the refrigerant.

When the discharge pulsation reducing member 20 is screwed into theconnection passage 10, desirably, the position and length of the screwthread for fastening the discharge pulsation reducing member 20 to theconnection passage 10 are appropriately adjusted in accordance withmachining conveniences, and to easily use a tool for coupling to theconnection passage 10, a head 24 of the discharge pulsation reducingmember 20 may preferably have one of various shapes.

In addition to a circular cross-sectional shape, the discharge pulsationreducing member 20 may have a polygonal cross-sectional shape.

Accordingly, the discharge pulsation reducing member 20 on or in whichthe pulsation reducing passage 21 is formed is mounted along the innerperipheral surface of the connection passage 10 connecting the firstchamber 210 and the second chamber 220 of the discharge muffler 200, sothat the refrigerant introduced into the first chamber 210 is passedthrough the inlet 22 and the pulsation reducing passage 21 of thedischarge pulsation reducing member 20, and is sent to the secondchamber 220 through the outlet 23.

That is, the length of the connection passage 10 can be extended throughthe pulsation reducing passage 21 on or in the discharge pulsationreducing member 20, so that the flow velocity of the refrigerantsupplied from the first chamber 210 to the second chamber 220 throughthe connection passage 10 can be reduced to remarkably dampen the noiseor vibrations generated in the compressor.

Preferably, the pulsation reducing passage 21 is adjustable in lengthand cross-sectional area to conduct pulsation control corresponding tothe pulsating components, and accordingly, the length andcross-sectional area of the pulsation reducing passage 21 areappropriately adjusted in accordance with the frequencies to control thepulsating components.

That is, the pulsation reducing passage 21 formed in the dischargepulsation reducing member 20 can have various shapes, such as ascrew-shaped passage, etc., to adjust the length thereof.

FIG. 7 is a graph showing the discharge pulsations between the inventionand a comparison example. According to the present invention, the graphshows the frequency bands of the refrigerant measured when the dischargepulsation reducing member 20 is disposed in the connection passage 10formed between the first chamber 210 and the second chamber 220, butaccording to the comparison example, the graph shows the frequency bandsof the refrigerant measured in the absence of the discharge pulsationreducing member 20. As shown in FIG. 7, it can be appreciated that thelow frequency components in the frequency bands between 100 Hz and 300Hz are reduced by the installation of the discharge pulsation reducingmember 20.

According to the present invention, the discharge pulsation reducingmember 20 is in the connection passage 10 between the first chamber 210and the second chamber 220, but it is not necessarily limited thereto.That is, the discharge pulsation reducing member 20 may be disposed atany position if it can reduce the vibrations and noise generated duringthe refrigeration cycle. For example, if enough space is in a valve seatsurface 213 of the cylinder block 100, the discharge pulsation reducingmember 20 may be disposed on or in the valve seat surface 213 and thepassage 212 of the first chamber 210 of the discharge muffler 200.

While the present invention has been described with reference toparticular illustrative embodiments, it is not to be restricted by theembodiments, but only by the appended claims. It is to be appreciatedthat those skilled in the art can change or modify the embodimentswithout departing from the scope and spirit of the present invention.

1. A hermetic compressor, comprising: a case; a cylinder block in thecase; a discharge muffler on or in an upper portion of the cylinderblock and having a first chamber and a separate second chamber, thefirst chamber and the second chamber being connected to each other by aconnection passage; and a discharge pulsation reducing member in theconnection passage and having a pulsation reducing passage along anouter peripheral surface thereof.
 2. The hermetic compressor accordingto claim 1, wherein the pulsation reducing passage and the connectionpassage form a passage for the refrigerant.
 3. The hermetic compressoraccording to claim 1, wherein the pulsation reducing passage of thedischarge pulsation reducing member has a screw or spiral shape.
 4. Thehermetic compressor according to claim 1, wherein the dischargepulsation reducing member is connected to the connection passage.
 5. Thehermetic compressor according to claim 1, wherein the dischargepulsation reducing member is tapered in a longitudinal direction andfixed to the connection passage by an interference fit.
 6. The hermeticcompressor according to claim 1, wherein the discharge pulsationreducing member has a head allowing a tool to couple the dischargepulsation reducing member to the connection passage.
 7. The hermeticcompressor according to claim 1, wherein the discharge pulsationreducing member has a cross-sectional shape selected from a circularshape and a polygonal shape.
 8. The hermetic compressor according toclaim 3, wherein the pulsation reducing passage has an inlet and anoutlet on opposed ends thereof in communication with each other in alongitudinal direction.
 9. The hermetic compressor according to claim 2,wherein the pulsation reducing passage of the discharge pulsationreducing member has a screw or spiral shape.
 10. The hermetic compressoraccording to claim 2, wherein the discharge pulsation reducing member isconnected to the connection passage.
 11. The hermetic compressoraccording to claim 2, wherein the discharge pulsation reducing member istapered in a longitudinal direction and fixed to the connection passageby an interference fit.
 12. The hermetic compressor according to claim2, wherein the discharge pulsation reducing member has a head having ashape allowing a tool to couple the discharge pulsation reducing memberto the connection passage.
 13. The hermetic compressor according toclaim 2, wherein the discharge pulsation reducing member has across-sectional shape selected from a circular shape and a polygonalshape.
 14. The hermetic compressor according to claim 9, wherein thepulsation reducing passage has an inlet and an outlet on opposed endsthereof in communication with each other in a longitudinal direction.